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An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth 's lithosphere that creates seismic waves.

A rocket sled is a test platform that slides along a set of rails, propelled by rockets. Sonic Wind No 1. This rocket sled was ridden by John Paul Stapp in the 1950s. As its name implies, a rocket sled does not use wheels and differs from a rocket car for this reason as it runs on rails.

Multitrack recording ( MTR ), also known as multitracking, is a method of sound recording developed in 1955 that allows for the separate recording of multiple sound sources or of sound sources recorded at different times to create a cohesive whole.

A rubber-tyred tram (also known as tramway on tyres, French: tramway sur pneumatiques) is a development of the guided bus in which a vehicle is guided by a fixed rail in the road surface and draws current from overhead electric wires (either via pantograph or trolley poles ).

A skid loader, skid-steer loader, SSL, or skidsteer is any of a class of compact heavy equipment with lift arms that can attach to a wide variety of buckets and other labor-saving tools or attachments. The wheels typically have no separate steering mechanism and hold a fixed straight alignment on the body of the machine.